Laserfiche WebLink
i • <br />SECTION 8: INNOVATIVE SHALLOW -TRENCH -OR BED SUBSURFACE SOIL <br />TREATMENT AND SEWAGE DISPOSAL SYSTEM <br />A. Applicability <br />1. Percolation Rate - The percolation rate must be faster <br />t an 60 minutes per inch. <br />.2. Depth to Groundwater - Depth to groundwater or seasonally <br />saturated area must a greater than three feet.. <br />3. Flood Hazard - There must be no, flooding hazard. <br />4. S1T ope - The land slope in the area being considered for <br />installation of the system must not be greater than 12%. <br />5. Position on the Landscape - The system shall be installed <br />on level areas, on top o rises on convex slopes, on <br />sides of rises on plane. The systems shall not be <br />installed in depressions, swales, or drainage -ways. <br />B. Trench Depth <br />The trenches or beds shall be installed to a depth not to exceed <br />:12 inches. <br />C. Trench Dimensions <br />General requirements and dimensions of the seepage trenches are <br />as follows:. <br />1. 'The bottom of the seepage trench shall be 'level. <br />2. Seepage trench excavations shall'be 2 to 3 feet in <br />width. The absorption area of a seepage trench shall <br />be computed by using the bottom area only and shall <br />conform to the standards given in the Code. <br />3.' Trench excavations shall be spaced at least 10 feet <br />ap art . <br />4'. -The individual laterals shall not be over 100 feet <br />long. <br />5. All other requirements of drainfield trenches as of <br />Section 6 apply. <br />D. Seepage -Beds <br />Seepage beds shall meet the requirements of a seepage trench <br />except that the excavation is more than 3 feet wide -and has <br />more than one distribution line. Distribution' lines in a <br />seepage bed shall be uniformly spaced no more than 6 feet <br />apart and no less than 3 feet apart and no more than 3 feet <br />from the sidewall. <br />.42 <br />